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A new numerical method for constructing the three-dimensional microstructure of S-RM using digital image processing technology

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Abstract

Soil-rock mixture (S-RM) is widely distributed in some accumulation slopes and commonly used as a backfill material in the field of geotechnical engineering. The mechanical properties of S-RM play a pivotal role in ensuring the stability of geotechnical engineering projects. The discrete element method (DEM), which can construct S-RM’s microstructure model, is an effective tool for studying its mechanical properties. Currently, the most realistic and precise approach for constructing a three-dimensional (3D) microstructure model of S-RM is digital image processing (DIP) technology using computed tomography (CT) scanning device or 3D laser scanning device. However, these devices are very expensive. This study aims to develop an economical and accurate DEM for constructing the 3D microstructure of S-RM using DIP technology with a conventional digital camera. Firstly, a digital camera was used to capture three sets of 2D images on real rock blocks around four circles at different angles. DIP technology was then applied to process the 2D images and construct the refined 3D rock block grid models. Subsequently, the geometric parameters of the grid models were compared with those of the corresponding real rock blocks to validate the accuracy and applicability of this method. The microstructure model of S-RM in the large-scale direct shear test was then established and verified for DEM simulations. Finally, the mechanical properties of S-RM were analyzed based on the evolution of the shear band, the rotation of rock blocks, and the change of contact force chain.

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Acknowledgements

The research described in this paper was financially supported by the National Natural Science Foundation of China (No. 51808083), the China Postdoctoral Science Foundation (No. 2020M673110), the Technology Innovation and Application Development Project of Chongqing in China (No. CSTB2022TIAD-GPX0046), the Construction Science and Technology Plan Project of Chongqing in China (No. CKZ 2022-1-3), the Technology Innovation and Application Development Project of Nan'an District of Chongqing(CN) (No.2022-24), the Research and Innovation Program for Graduate Students of Chongqing in China (No. 2022S0002).

Funding

National Natural Science Foundation of China (No. 51808083), China Postdoctoral Science Foundation (No. 2020M673110), Technology Innovation and Application Development Project of Chongqing in China (No. CSTB2022TIAD-GPX0046), Construction Science and Technology Plan Project of Chongqing in China (No. CKZ 2022–1-3), Research and Innovation Program for Graduate Students of Chongqing in China (No. 2022S0002), Technology Innovation and Application Development Project of Nan'an District of Chongqing(CN) (No. 2022–24).

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Authors and Affiliations

  1. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

    Yiliang Tu, Hang Long, Zhong Fang, Lizhou Zhang & Wenlong Yang

  2. China Merchants Chongqing Communications Research and Design Institute Co., Ltd, Chongqing, 400067, China

    Yiliang Tu & Hejun Chai

  3. China Construction (Shenzhen) Design International Co., Ltd, Shenzhen, 518057, China

    Zhong Fang

  4. College of Civil Engineering, Chongqing University, Chongqing, 400045, China

    Xinrong Liu

  5. Chongqing Survey Institute, Chongqing, 401121, China

    Lizhou Zhang

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  1. Yiliang Tu
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Contributions

TY—Methodology, Writing-review & editing. LH—Writing—review & editing, Validation. FZ—Software, Formal analysis. Writing-original draft. CH—Formal analysis, Supervision. LX—Software, Investigation. ZL—Software, Formal analysis. YW—Integration.

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Correspondence to Yiliang Tu.

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Tu, Y., Long, H., Fang, Z. et al. A new numerical method for constructing the three-dimensional microstructure of S-RM using digital image processing technology. Granular Matter 26, 24 (2024). https://doi.org/10.1007/s10035-023-01393-0

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